Hibernate3.3.2_多对一单向关联

最新推荐文章于 2025-07-28 23:27:29 发布

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本文详细介绍了数据库操作及实体关系建模的过程，通过实际案例展示了如何使用Hibernate框架进行对象关系映射。


package com.bjsxt.hibernate;

public class Group {
	private int id;
	private String name;

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}


package com.bjsxt.hibernate;

public class User {
	private int id;
	private String name;
	private Group group;

	public Group getGroup() {
		return group;
	}
	public void setGroup(Group group) {
		this.group = group;
	}

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}
[color=red]User(many)---Group(one)[/color]


Group.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.bjsxt.hibernate.Group" table="t_group">
		<id name="id">
			<generator class="native"></generator>
		</id>

		<property name="name"></property>

    </class>

</hibernate-mapping>


User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.bjsxt.hibernate.User" table="t_user">
		<id name="id">
			<generator class="native"></generator>
		</id>

		<property name="name"></property>
		<many-to-one name="group" column="groupId" />
    </class>

</hibernate-mapping>


14:27:21,165  INFO org.hibernate.tool.hbm2ddl.SchemaExport:154 - Running hbm2ddl schema export
14:27:21,168 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:170 - import file not found: /import.sql
14:27:21,168  INFO org.hibernate.tool.hbm2ddl.SchemaExport:179 - exporting generated schema to database
14:27:21,323 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 - 
    alter table t_user 
        drop 
        foreign key FKCB63CCB6C3D18669
14:27:21,332 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:288 - Unsuccessful: alter table t_user drop foreign key FKCB63CCB6C3D18669
14:27:21,333 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:289 - Table 'hibernate.t_user' doesn't exist
14:27:21,333 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 - 
    drop table if exists t_group
14:27:21,337 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 - 
    drop table if exists t_user
14:27:21,340 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 - 
    create table t_group (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )
14:27:21,479 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 - 
    create table t_user (
        id integer not null auto_increment,
        name varchar(255),
        groupId integer,
        primary key (id)
    )
14:27:21,589 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 - 
    alter table t_user 
        add index FKCB63CCB6C3D18669 (groupId), 
        add constraint FKCB63CCB6C3D18669 
        foreign key (groupId) 
        references t_group (id)
14:27:21,884  INFO org.hibernate.tool.hbm2ddl.SchemaExport:196 - schema export complete

inverse知识点
http://lijiejava.iteye.com/blog/776587